The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 02, 2021
Filed:
May. 03, 2019
Applicant:
Cnpc Usa Corporation, Houston, TX (US);
Inventors:
Assignee:
CNPC USA Corporation, Houston, TX (US);
Primary Examiner:
Int. Cl.
CPC ...
C09K 8/12 (2006.01); C08L 33/26 (2006.01); C08L 41/00 (2006.01); C09K 8/035 (2006.01); C09K 8/508 (2006.01); C09K 8/512 (2006.01);
U.S. Cl.
CPC ...
C09K 8/12 (2013.01); C08L 33/26 (2013.01); C08L 41/00 (2013.01); C09K 8/035 (2013.01); C09K 8/508 (2013.01); C09K 8/512 (2013.01);
Abstract
A combination of three polymers including a crosslinked acrylamide-TBAS copolymers in inverse emulsion form, N-vinyl pyrrolidone-acrylamide-TBAS terpolymer, and crosslinked N-vinyl pyrrolidone-acrylamide-TBAS acts as high temperature, high pressure fluid loss control additives for water-based drilling fluids systems. The combination is particularly useful for high salt, high density drilling fluids, and high temperature applications.